tailodds FORECAST
Connection · two tickets · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026

Ontario → Dulles via Seattle: arrives on time 84%

  1. 17:59 ONT → 20:50 SEA
    DL 4031 · Delta, flown by SkyWest · 2h 51m · 90% on time, 0.3% cancelled
  2. 2h 30m layover in Seattle (SEA) · 90 min minimum on separate tickets
  3. 23:20 SEA → 07:22 IAD +1 day
    UA 264 · United · 5h 02m · 91% on time, 4.5% cancelled

Total trip 10h 23m, scheduled departure to arrival (Dulles is 3 h ahead of Ontario). Times are local. Both flew on 42 of the last 56 days.

Makes the connection98%The first flight arrived more than 60 minutes late on 2% of the days it flew: too late for the 90-minute minimum connection on a 2h 30m layover.
Arrives on time84%First flight not cancelled (0.3% are) × connection made (98%) × second flight not cancelled (4.5% are) and within 15 minutes (91%).
Total trip10h 23mONT 17:59 to IAD 07:22, layover included

Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.